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Bulk change of records (change all instances of IP address x.x.x.x to y.y.y.y)

Import/export zone files (useful for migrating to/from the service)

Low cost :-)

Thanks for that.

What would you consider as "low cost"?

I think amazon have set a pretty competitive benchmark with Route 53. ($1 per zone per month plus $0.50 per million queries)